Gear-cutting machine.



C. E. DERR.'

- GEAR CUTTINGMACHINE.

APPLICATION FILED AUGJ. i916- Patented Jan.14,1919.

3 SHEETS-SHEET 1.

C. E. DERR. GEAR CUTTING vMACHINE. APPLlCATlON FILED AUGJ, \916.

Patented Jan.14,1919.

3 SHEETS-SHEET 3.

- caries.

. CHARLES E. DEB/It, 0F DETRGIT, MICHiGAN.

GEAR-CUTTING MACHINE.

Specification of Letters Patent. Patented Jan, 1%, L919. Original application filed February 11, 1913, Serial No. 747,677.

Divided and this application filed August 7,

191$. Serial N0. 113,6 i5.

To, all whom it'mag concern Be it known that 1, CHARLES 'E. Dunn, a citizen of-the United States, and resident of Detroit, Wayne county, State of Michigan, have inventedcertain new and useful Improvements in Gear-Cutting Machines, of which the following is a specification.

-This application is a division of copend' ing application Serial No. 7475677, filed February 11, 1913, and relates to gear cutting machines, particularly to improvements in means for positioning the gear cutting tool.

1 thereto the head '12.

One object of the invention is to provide improved means for minutely adjusting the I position of the tool in the tool holder.

A further object is to provide an improved set of gages whereby the tool may be readily set in its proper position.

Other objects and the features of novelty will be apparent from the following description, taken in connection with the accompanying drawings, in which:

Figure 1 1s aplan view of a portion of a gear cutting machine and showing my im-- provements; 1

Fig. 21s a longitudinal section through the machine, and showing in elevation oneof my improved gages; a

Fig. 3 is a plan view of the parts shown in Fig. 2;

Fig. 4 is a side elevation ofthe tool hoider with another of the'gages shown in position for setting the tool;

Fig. 5 1s a front elevation of the parts shown in Fig. 4; and

Fig. 6 is a. side elevation of the parts shown in Fig. 1.

Referring to the drawings, 10 indicates the frame of the .machine on which is slidably mounted the rain 11 having secured -Tl1o lonmd 1). io Invn. vidcd with a suitable dove-tail slotlli in its front face in which is arranged the dovetall 14 of the tool carriage 15. The carlL go 15 has pivoted thereto the tool sup porting apron 16, the pivot 16' being arranged at an angle to the direction of movement of the ram 11 (see Fig. 1) and sub- Serial No. 725,328, filcd October 1.1, 1912,

this machine is especially adapted for cutting bevel gears having spiral or curved teeth and the curvature of the teeth is formed by combining with the usual reciprocating movement of the ram and tool carr1age,-a transverse movement of the carriage. The ram and the tool carriage may .be reeiprocated in any suitable manner and for this purpose I have provided a gear wheel 17 driven from any suitable source of for a plate 26 which is secured on the plate 22 by means of suitable bolts 27 passing through slots 28 in the plate 26. The plate 26 as thus arranged constitutes aform of turn table. In order to hold the plate 26 in any desired position, the plate 22 is pro through which pass vided with the lugs 29 the adjusting screws 30, these screws engaging one of the edges of the plate 26 so that by turning these screws in opposite directions it is possible to swing the plate 26 on the raised portion 23 of the plate 22. The plate 26'is provided with a suitably formed eam slot 31 in which moves the cam roller 32 carried by the pin or bolt 33 on the tool carriage 15. The parts just described con stitute means for adjusting the tool laterally. p

From Fig. 1 it will be obvious that as the ram 11 is reciprocated the tool carriage will be moved laterally by the engagement of the roller with the edges of the cam slot 31. In

order to prevent back lash of the roller in' edges 2-1 and 25,.

the slot31 a' 'Huaintain the roller in yield- 9 able "Intact with'onc side of the slot I have provide 1 a comparatively stiff spring 341 which s arranged on a bolt or pin 35 be- 'tweer the brackets 36 and 3?. The bracket 36 i secured to the tool carriage 15 and the I brr eket 37 is secured to the head 12 of the 1"1 11; The bolt or-pin 35 is preferably SCCUIOU in the bracket 37 andslides freely through a suitable opening in the bracket 3 so that as the ram reciprocates the spring 34 will be alternatelycontracted and extended and will maintain the roller inyieldable 0on tactwith the side 38 of the cam slot 31.

The tool apron 16 has arranged on its front face the tool holder 39, this hol e e-i ice ing held in position by means of a clamping plate 41, which is fulcrumed on the screw 40 and has its side' 42'forced intov engagement with the tool holder, to secure the latter, by means of a screw 43. The tool holder 39 may be adjusted vertically by means of a, screw M which is held in a bracket 45 on the' a ron 15. The tool holder is provided with a ovetail slot in its lower side which receives the wedge shaped tool 46, the cutting edge 47 of whichis arranged at the forward end of the tool. The rearward end 48 of the tool i6 is beveled and has arranged in engagement therewith a wedge 49 which may be adjusted vertically'by means of a screw 50 for the purpose ofmoving the tool forwardly. The tool maybe clamped in any desired position by meansof a set screw 51.

' In order to cut the teeth accurately in the .20 blank A it is necessary that the forward edge of the tool be accurately set in a certain position because the tool must engage the blank at the roper pointin its lateral movement otherwise the tooth spac'e would be displaced laterally from the required position. For

' this purpose I'have provided a gage 87 (see Fig. 4), this'gagebeing adapted to" engage I. the face 86 of the tool holder and having a downwardly projecting arm 88 adapted to -engage the forward end47 of the tool, the

.tool being moved into engagement with the arm 88 by means of the wedge 49 and the adjusting screw 50. It will thus be obvious that by the use of the gage 87 the forward or v .35 cutting edge of the tool 48 may be accurately set relative to the tool holder.

a ,In addition to accurately determining the position of the forward end 47 of the tool it will be seen that itis also essential to accu- 40 rately' determine the position of the tool laterally and for this purpose I provide a gage 89 havingsuita'ble slots for engaging the underside of the tool and which is preferably mounted on a rod 90 carried in a re- 'cess 91 in the frame 10 of the machine (see Figs. 2 and 3). The rod 90 is provided with rack teeth 92 which are engaged by the actuating gear 93, this gear being rotated by means of a hand-wheel 94. The rod 90 prefera'bly extends to the rearward end of the machine and is provided with a suitable indicating scale 95 by means of-which the longitudinal position of the rod 90 may be determined by the registration of the lines of 55, the scale 95 with a suitable index such as the 6C ment of the holder with respect to the ram given by the cam, it, is clear that the tool rear edge 96 of the frame 10. As the tool holder has motion in a curved path which is the result of the longitudinal movement given by the ram and the transverse moveholder has a different position transversely of the ram for every point in the stroke of the latter. Hence it is necessary to provide some means for always setting the ram at a fixed point when the gage 89 is used. For this purpose the ram 11 has a bracket 82 formed with a slot 83 adapted to receive an armor dog 84 pivotally mounted on a bracket 85 on the frame 10 (see Fig. 1).

The arm 84 is normally in the position shown but when it is desired to adjust the tool transversely of the ram the latter is moved to a position Where the slot 83 is in alinement with the arm 84, then the latter is thrown over into the slot thus locking the ram to the frame of the machine. This establishes a definite position for the tool holder transversely of the machine, and longitudinally of its stroke. When the ram is thus locked, if the tool does not fit the slot in the gage 89, the holder and tool may be adjusted laterally by means of the bolts 30 until the tool drops into the said slot.

The gage 89 may also be provided with a slot 97 for setting the tool when it is desired to cut gears having straight teeth.

It is believed that the operation of the positioning means will bethoroughly understood from the foregoingdescri-ption taken,

in connection with the drawings. It will also be understood that various changes may be made in the details of construction Within in the general direction of its reciprocation, and a gage for determining the setting of the cutting edge of the tool relative to the holder.

2. In a machine of the class described, means for setting the tool comprising a rod adjustable in the eneral direction of movement of. the tool,and means carried by said rod for determining the position of the tool transversely of the machine.

3. In a machine of the class described, the combination of. a frame, a ram slid-ably mounted on the frame, and means for locking the ram to the frame. v I

4 In a machine of the class described, the combination of a frame, a ram slidably mounted thereoh, and means including'a pivotally mounted arm on one part adapted to engage a slot in the other part for the purpose of locking the ram to the frame.

5. In a machine of the class-described, the combination of a frame, a ram, aslotted bracket secured to the ram, an arm pivoted to the frame and adapted to engage the slot in said bracket forthe purpose of locking the ram to the frame.

Cir

6. In a machine of the class described, means for setting the tool comprising an adjustable rod means carried by said rod for determining the position of the tooi and scale means for determining the position of the rod.

K. In a machine of the class described, means for setting thetool comprising an ad justable rod, a rod for determining the and a scale on said rod for determining the position of the rod.

8. In a machine of the class described, means for setting the tool comprising an ndjustahle rod, a sio'tted gage carried at one end of said rod for deteri'nining the position. of the tool, a scale at the other end of said. rod for determining the position of the rod, rack teeth insermedietethe ends of said rod and a pinion n'ieshing with said rack teeth and reciprocating said rod.

9. In a machine of the ciass described, means for setting the tool com 'irising a rod adiustabie in the general direction of moveposition of the tool slotted gage carried by said.

ment of the tool, a slotted gage carried at, one end of said rod for determining the position of the tooha scale at the other end of said rod for determining the position of the rod, rack teeth intermediate the ends of said rod and a pinion meshing; with said rack teeth and reciprocating said rod.

10. In a machine of the class described, the comoinationof a frame, a ram slidably mounted on the frame, a toolholder, means for adjusting the holder laterally relative to the path of the ram, means for locking the rain to the frame at one pointof its stroke, and means Jim-determining the position of the tool transversely of the machine.

11. In av machine of the class described, in combination, a reciprocating tool, means for adjnstingthe tool laterally of the machine, means for locking the tool against movement at one point of its stroke, and a gage for determining the position of -the tool trans versely of the machine.

In testimony whereof I affix my signature.

: CHARLES E. DEER. 

